From 98ab1d968030494fbfbe3688929b761382b28b09 Mon Sep 17 00:00:00 2001
From: Juan Manuel Tomas <jtomas1815@gmail.com>
Date: Thu, 5 Aug 2021 01:18:19 -0300
Subject: Initial Commit

---
 README.md   |  8 ++++++++
 flag.h      | 57 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 test/main.c |  8 ++++++++
 3 files changed, 73 insertions(+)
 create mode 100644 README.md
 create mode 100644 flag.h
 create mode 100644 test/main.c

diff --git a/README.md b/README.md
new file mode 100644
index 0000000..13f442a
--- /dev/null
+++ b/README.md
@@ -0,0 +1,8 @@
+* Shady Flag Library
+
+This is a library for parsing command line flags.
+Just include the .h file and you're good to go.
+Example:
+```int hello = flag_int("--testing", 420, "<something> Hello World");```
+This will put on the variable hello the value following the --testing command
+line flag, or the default value 420 if the flag is not present.
diff --git a/flag.h b/flag.h
new file mode 100644
index 0000000..3601d01
--- /dev/null
+++ b/flag.h
@@ -0,0 +1,57 @@
+#include <string.h>
+#include <stdlib.h>
+#include <stdio.h>
+
+#define flag_init main
+
+int argument_count;
+char **arguments;
+int docstring_count;
+char **docstrings;
+int flag_fail;
+
+int flag_int(const char *flag_name, int default_value, const char *docstring) {
+        int flag_name_length = strlen(flag_name);
+        int docstring_length = strlen(docstring);
+        char *new_docstring = malloc(flag_name_length + 4 + docstring_length);
+        new_docstring[0] = '\t';
+        memcpy(new_docstring + 1, flag_name, flag_name_length);
+        new_docstring[flag_name_length + 1] = ' ';
+        memcpy(new_docstring + flag_name_length + 2, docstring, docstring_length);
+        new_docstring[flag_name_length + 3 + docstring_length] = '\0';
+        docstrings[docstring_count] = new_docstring;
+        docstring_count++;
+        for (int i = 0; i < argument_count; i++) {
+                if (strcmp(arguments[i], flag_name) == 0) {
+                        if (i + 1 < argument_count) {
+                                return atoi(arguments[i + 1]);
+                        } else {
+                                flag_fail = 1;
+                        }
+                }
+        }
+        if (flag_fail) {
+                printf("Usage: %s [flags]\n", arguments[0]);
+                puts("Available flags:");
+                for (int j = 0; j < docstring_count; j++) {
+                        printf("%s\n", docstrings[j]);
+                }
+                exit(1);
+                return 0;
+        } else {
+                return default_value;
+        }
+}
+
+int main_func();
+
+int flag_init(int argc, char **argv) {
+        argument_count = argc;
+        arguments = argv;
+        flag_fail = 0;
+        docstring_count = 0;
+        docstrings = malloc(argc * sizeof(char *));
+        main_func(argc, argv);
+}
+
+#define main main_func
diff --git a/test/main.c b/test/main.c
new file mode 100644
index 0000000..3b6c977
--- /dev/null
+++ b/test/main.c
@@ -0,0 +1,8 @@
+#include <stdio.h>
+#include "../flag.h"
+
+int main() {
+        int test1 = flag_int("-j", 69, "<number of cores> Specifies the number of cores to be used.");
+        printf("This is the first test argument: %d\n", test1);
+        return 0;
+}
-- 
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